Patent GB-438516-A (GB)
Abstract: 438,516. Calculating-machines. MERCEDES BUROMASCHINEN - WERKE AKT.- GES., Bensliausen, Prussia, Germany. May 10, 1934, Nos. 14121 and 14122. Convention dates, May 15, 1933 and Nov. 27, 1933. [Class 106 (i)] A machine for multiplying by repeated addition and dividing by repeated subtraction comprises means whereby the multiplier and the multiplicand, or the divisor and the dividend, may be set simultaneously, the multiplier being transmitted to multipliersetting mechanism and the dividend being transmitted to the totalizer by means controlled by a member which also controls the remaining operations of the machine for completing the calculation. The machine can also add, subtract, perform " negative " multiplication and division and three-factor multiplication. Addition. Addition is initiated by pulling forward a finger lever 17, Fig. 24, and depressing a key 4. The movement of the lever 17 draws forward a slide 326 so that a pin 324 on a lever 314 is positioned in the horizontal limb 325a of a right-angled slot in the slide 326. A pin 313 on the addition key 4 pushes down the lever 314 about its pivot 315, the pin 324 causing the slide 326 to partake in this movement. A projection 319 on the lever 314 rocks anticlockwise a key-locking bar 322 freely rotatable round a shaft 310 and contacting with a control plate 391. The key-locking bar 322 is maintained in effective position until the end of the cycle, even if the addition key 4 is released, by a lever 131 rocked by a crank disc 117 on a shaft 116. A link 335 connected to the bar 322 rocks anticlockwise a lever 336 contacting with a lever 353 engaging a pin 357 on a lever 347 which is thus rocked anticlockwise. The lever 347 pivotally carries a lever 22 which is hereby slid off the periphery of a disc 20 on the main shaft 3. The lever 22 can then rock anticlockwise under spring action to allow the closure of contacts 362, 364 in the circuit of an electric motor D. The lever 336 also turns clockwise, through a spring 342, a shaft 265 carrying a clutch lever 44 which is thus rocked to the right to release a pawl 65 pivoted in a main actuating clutch. The pawl 65 is rocked anticlockwise by a spring so that its nose engages a cam secured to the mainshaft 3, whereby the main actuating clutch is clutched to this shaft and rotated clockwise. The shaft 116 driven from the main actuating clutch has attached to it a connecting rod 124 which drives a " proportional rack system " (not shown), of the kind described in Specification 365,058. When a numeral key is depressed, one of a series of pinions feathered to a shaft 159a, Fig. 40, is engaged with that rack of the system of ten racks which will give the pinion the corresponding differential movement. This movement is transmitted to the shaft 501 of the totalizer 499R by coupling pinions 156 pivoted in a frame rocked to effect the connection by a maltese-cross mechanism driven from the shaft 116. Drive of revolutions register in addition. To the main actuating clutch is secured a pinion connected through gearing which drives two wheels 135, 163, Fig. 11a, in opposite directions. In adding operations, the wheel 163 is connected by a sliding key 170 to a sleeve 173 carrying a pinion 169 driving a shaft 178, Fig. 15. This shaft is provided with a broad tooth 199 which turns through on tooth space a wheel 210 geared to the numeral wheel 211 of the revolutions register. The wheels 210, 211 are carried in the sliding totalizer carriage and the wheels of any denomination can be brought adjacent the tooth 199 for actuation. Transfer mechanism for revolutions register. When a numeral wheel 211 passes through zero a pawl upon the wheel turns the next higher gear train 210, 211 through half a tooth space. The movement is completed by one of a series of projections 191a ... 191d on the shaft 178 engaging the now-displaced tooth of the said next higher wheel 210. One-revolution mechanism. To prevent more than one cycle, even if the adding key is held depressed, a cam 124a, Fig. 24, on the connecting rod 124 drags the levers 314, 326 to the right clear of the pin 313 on the adding- key stem. A spring 398 can then restore the bar 322 whereby the clutch lever 44 is moved into a position in which it unclutches the main actuating clutch after one revolution. The lever 22 is also moved to the right so that the cam surface 20g rocks it to open the contacts 362, 364. Releasing depressed numeral keys. The slide 326 which is rocked by the lever 314 when the adding key 4 is depressed with the finger lever 17 in adding position has a lug 333, Fig. 25, which rocks the bent end of a link 407 downwards against the cam end of a lever 437 attached to a key-releasing bar 418. A lever 409 pivoted to the link 407 is rocked anticlockwise towards the end of the cycle about the point 408 by a cam 412 driven from the main actuating clutch. The link 407 is thus restored to the right and, by the engagement of its bent end with the cam part of the lever 437, rocks this lever and the attached key-releasing bar 418 clockwise whereby the key-locking bars 440 are moved to the right to release any depressed numeral keys T. The keys can also be manually released by a key 6 (L<111>) Fig. 19, which contacts with the lever 437. Repeated addition. To effect this, the item is set up, the finger lever 17 is moved into the position shown in Fig. 24 and the adding key 4 is depressed. The slide 326 is thus left in the position shown so that the pin 324 on the lever 314 moves in the slot 325 and does not depress the slide 326. The end of the slide 326 is then not in the path of the cam 124a so that the latter cannot swing the slide and lever 314 to the right clear of the pin 313 on the adding key stem. Operation thus continues as long as the adding key is held depressed. Since the slide 326 is not depressed its lug 333 does not set the key-restoring mechanism 407, 437, 418. Subtraction. Depression of the subtraction key 5, Fig. 24, rocks clockwise a lever 294 which turns anticlockwise a lever 297 and shaft 300. A lever system 366, 369 connected with the shaft 300 then withdraws a pin 375 to free the rack 367a of the proportional rack system and inserts a pin 372 to lock the rack 367b, whereby the complement of the amount set on the keyboard can be entered in known manner into the totalizer. A pin 430 on the subtraction key lever engages the lever 314 and single or repeated subtraction, according to the position of the finger lever 17, takes place as described above in connection with addition. Drive of revolutions register in subtraction. The anticlockwise rocking of the shaft 300 causes a control plate 301 to move a link 304, Fig. 47, to the left by the engaging of a projection 305 on the link with a recess 301a in the plate. The link 304 moves the sliding key 170 Fig. 11a, to connect the pinion 169 with the wheel 135. The pinion 169, the shaft 178, Fig. 15, and the revolutions register are thus driven in the subtractive direction. Power-driven zeroizing-mechanism for totalizer. Depression of the totalizer zeroizing key (L<11>), Fig. 19, causes the clockwise rocking of a lever 358 about a pivot 452. A roller 356 on the lever 347 is engaged by the lever 358 whereby the lever 347, 23 is rocked to close the motor contacts 362, 364. An arm 454 of the lever 358 rocks a lever 98 clockwise about its pivot 99 to allow a zeroizing clutch to be clutched to the main shaft 3. A crank-pin 109a on the zeroizing clutch rocks a link 109 and lever 472 to reciprocate the end 477 of a link 473 pivoted to the lever 472. Another arm 459 of the lever 358 rocks clockwise a two-part lever 466 about a pivot 462 so that the end 477 of the link 473 is engaged with teeth 485 Fig. 40, of a rack 486 slidably mounted in the totalizer carriage. The rack also has other teeth 496 engaging pinions 498 meshing with pinions 500 on the numeral wheel shafts 501. The pinions 498, 500 have gaps which come opposite each other when the numeral wheels are turned to zero by the reciprocating movement communicated to the rack 486 by the part 477. Power-drive zeroizing-mechanism for the revolutions register. Depression of the revolution register zeroizing key 8 (L<1>), Fig. 19, causes a clockwise rocking of a lever 359 about a pivot 517. The roller 356 on the lever 347 is engaged by the lever 359 whereby the lever 347, 23 is rocked to close the motor contacts 362, 364. An arm 519 of the lever 359 rocks the lever 98 clockwise to clutch the zeroizing clutch to the mainshaft 3 so that a link 538 is reciprocated by the parts 109, 482, 481, 472. The end 540 of the link 538 is engaged with a rack on the totalizer carriage similar to the rack effecting the zeroizing of the totalizer by a projection 523 of the lever 359 rocking a lever 524 the end 536 of which lifts the link 538. The rack engages toothed wheels geared to the numeral wheels and having gaps which are adjacent when the wheels are zeroized by the reciprocation of the rack from the link 538. Over-run preventing pawls are provided on one of the sets of toothed wheels. Multiplication. The machine has sixteen denominational banks of numeral keys. The multiplier is set up on the eight left-hand banks and the multiplicand on the eight right-hand banks. When the multiplication key 11, Fig. 26, is depressed a pin 683, Fig. 28, on the mutiplication key lever 634 rocks clockwise a lever 685 which draws a link 687 to the left until it is latched by a latch 762, the multiplication key being thus held down. A pin 641, Fig. 26, on the multiplication key lever rocks a lever 644 connected to a lever 649 secured to a shaft 651 which is thereby rocked clockwise. A lever 655, Fig. 34, on the shaft 651, engages a sleeve 658 secured to a shaft 587 which shaft is then moved to the right so that a crank-pin 621 on the shaft is coupled with a gear wheel 618 engaging a pinion 619 on a shaft 19 driven from the main actuating clutch. Another pin 639, Fig. 24